Write down the equation of a line whose gradient is $2$2 and crosses the $y$y-axis at $\left(0,1\right)$(0,1).
Express your answer in gradient-intercept form.
A carpenter charges a callout fee of $\$150$$150 plus $\$45$$45 per hour.
Write down the equation of the line in gradient-intercept form, given that its slope is $-3$−3 and its $y$y intercept is $-2$−2.
Write the equation of a line which has gradient $\frac{2}{3}$23 and goes through the point $\left(0,3\right)$(0,3).