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Which line cuts the (y)-axis at ((0,-16)) and increases (y) by (70) when (x) increases by (7)?

Answer and explanation

Correct answer: \(y=10x-16\)

The slope is \(\frac{\Delta y}{\Delta x}=\frac{70}{7}=10\). Since the line meets the y-axis at \((0,-16)\), its y-intercept is \(-16\). Substituting \(m=10\) and \(c=-16\) in slope-intercept form \(y=mx+c\) gives \(y=10x-16\). In \(y=70x-16\), the slope would be 70, so a rise of 7 in x would increase y by 490. Exam tip: find the slope from the given changes first, then use the y-intercept.

Related tags

Linear EquationsSlopeY-InterceptSlope-Intercept FormCoordinate GeometryPolynomialsSlope And Y InterceptIntroduction To Polynomials

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