<span>The equation of any straight line, called a linear equation,can be written as:y=mx+b, where m is the slope is the slope of the line and b is the y intercept. The y- intercept of the line is the value of y at the point where the line crosses the y axis</span><span>.
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Answer:
42km
Step-by-step explanation:

= h Multiply both sides by g to cancel out the fraction
f - 7 = gh Add 7 to both sides
f = gh + 7